4. = Water at 20deg Celsius is to be pumped from a reservoir (ZA = 5 m) to another reservoir at a higher elevation (ZA 13 m) through two 36-m-long pipes connected in parallel, as shown in the figure below. The pipes are made of commercial steel, and the diameters of the two pipes are 4 and 8 cm. Water is to be pumped by a 70 percent efficient motor-pump combination that draws 8 kW of electric power during operation. The minor losses and the head loss in pipes that connect the parallel pipes to the two reservoirs are considered to be negligible. Determine the total flow rate between the reservoirs and the flow rate through each of the parallel pipes. You can assume the friction factor is 0.02 in both pipes. ZA = 5 m Control L₁ = 36 m D₁ = 4 cm volume -boundary Pump D₂ = 8 cm L₂ = 36 m ZB = 13 m

An elevator has a rated capacity of 2200 lb. It can transport people at the rated capacity between the first and the fifth floors, with a vertical distance of 15 ft between each floor, in 7 s. Estimate the power requirement for such an elevator.

For Problems 11.11, 11.12, and 11.13, calculate the U-factors.

You serve as the president of XYZ corporation, which is an energy intensive manufacturing operation. You have four boilers to produce steam and electricity for your operations. One is a semi-suspension fired boiler with a capacity of 100 tons of coal per hour. The boiler can also burn supplemental fuel such as coconut or macadamia nut shells. The other three boilers arc peaking units and burn fuel oil. The City of Podunk has approached you about the possibility of burning solid waste as a supplemental fuel. As the president of the XYZ Corporation, you need to develop answers to many political, social, and technical questions before you make a commitment to the city. a. What specific questions would you ask your own power plant engineer about the possibility of accepting Podunk’s MSW? b. What specific additional data would you need from the city before you discuss this further?